CSS not rendering in IE for PC

Greetings everyone! I've been working on the following page for a couple of days now, and it looks fine in Safari and Firefox, but all my CSS fail in IE. I don't know what the problem is. Feel free to view the page at the following url http://www.netunification.com/demo/

I spoke with a friend and he speculates IE is having problems with the float command. I'm not so sure of this because I used the same CSS techniques while building the following site (http://www.the904.com/demo/).

The904 page renders perfectly in IE and I can't figure out what the difference is between the pages. I thought I used the same concept with both pages.

I've been trouble shooting the problem for a couple of days now, but I haven't had any luck. Can please someone take a look at my net u page (http://www.netunification.com/demo/) and suggest a solution

Thanks in advance for any/all assistance. Your time and effort is greatly appreciated!

Good Question?

Why are you using XHTML 1.0 Transitional? What exactly are you transitioning from?

All new documents should be written in HTML 4.01 Strict or XHTML 1.0 Strict.

I used a HTML editor to put the page together, so I simply used the current settings in the application to put the page together. I just got back into webpage design recently after a couple of years hiatus, so I'm not exactly sure of what XHTML 1.0 transitional is. I'll use the XHTML 1.0 Strict and see if it fixes the problem. Thanks. I'll let you know if it works...

Work In Progress?

I've validated my code to XHTML 1.0 Strict standards with one error remaining and things are beginning to look a lot better. I can't seem to pinpoint where the last error is coming from. Do you have any ideas?

And for some reason I'm having a positioning problem with my Headliner text in IE (PC). Again, it looks fine in other browsers, but it's not rendering properly in IE. Any suggestions?

Still having problems...

Kravvitz,
I've done everything you've specified but I'm still having rendering problems. It's not rendering correctly in either of the browsers that I've tested it in (Firefox (Mac) and Internet Explorer (PC)). I've created a page with snap shots of exactly what I'm seeing on my end. The link is: